People’s public communication不要大写.
the sharp of the earth=〉the sharpness of the earth
was a ball =〉was a sphere
solve people’s unknown=>solve people’s unknown problem.
at Classical Period,=> during the Classical Period,
was effectively reminded in audience’s mind.=> effectively reminded the mind of the audience.
with their own styles => in their own styles
communicated-windows=>windows of communication
are still available => are still applicable
contributed the => contributed to the
he also improved=> but also improved